import {v4 as uuidv4} from 'uuid'
//要生成随机字符串，且每次执行不能发生变化，游客身份持久存储
export const getUUID=()=>{
//先从本地存储中获取uuid
    let uuid_token = localStorage.getItem('UUIDTOKEN')
    if (!uuid_token){
        //生成游客信息
        uuid_token=uuidv4()
        localStorage.setItem('UUIDTOKEN',uuid_token)
    }
    return uuid_token
}